pH Of Water Samples Research Articles

PHYSICO-CHEMICAL ANALYSIS OF OGUTA LAKE WATER AND ITS EFFECT ON PHYTOPLANKTON POPULATION

Samples were collected from the three sampling stations namely; Up, Mid and Downstream respectively to investigate the effect of nutrients concentration on the phytoplankton in Oguta Lake. The methods used were electrometric, argentometric titration, phenate spectrophotometric, colorimetric, cadmium reduction and acetone extraction spectrophotometric methods were used to determine the pH of water sample, chlorides, sulphate, ammonia, phosphorus, nitrate, nitrite, chlorophyll-A, conductivity, turbidity, chemical oxygen demand, copper, colour, total dissolved solid, respectively. However, serial dilution was carried out using the spread plate or pour plate method was used to determine the microbial analysis of the sample. At the end of these researches, the Physico-chemical parameters analysed showed that Oguta Lake had total dissolved solids values of 6.50 ± 0.06mg/l, 6.50 ± 0.14 and 6.50 for upstream, mid stream and downstream respectively. The result showed there was no significance total dissolved solids difference between the various stream points (P0.05). the colour of the Lake showed significant difference ranging from 17.00 ± 1.41 and76.00 V 1.41 in upstream and downstream and the lowest value at upstream. The pH range in this study indicates that the water may be acidic (5.54-7.31). Phytoplankton assemblages obtain across the three stream points showed only three divisions and 78 species. The identified divisions and species are comprised of Eurcharyta (44), Cyanophyta (25) and Chlorophyta (9). Eurkaryta recorded 100%, 5% and 15% abundance in upstream, midstream and downstream respectively, while Cyanophyta recorded the highest abundance at downstream with 75%, Chlorophyta only was identified at the midstream and was least abundance with 23%. The phytoplankton diversity indices done showed that downstream was most diverse having the highest Shannon Weiner Index and Evenness Index of 3.631 and 1.212 respectively. In relation to physicochemical and phytoplankton abundance, the findings in this study is contradictory to some researches. They reported positive correlation of phytoplankton with phosphate and nitrate. There was negative correlation of phosphate with Eurkaryta and Chlorophyta, except for Cyanophyta that showed positive correlation with phytoplankton but not very significant. These low levels of phosphate and nitrate may be the cause of low phytoplankton levels.

Potential associations between Schistosoma mansoni infection and physico-chemical characteristics and water-related human activities in Côte d'Ivoire: a cross-sectional study.

Schistosomiasis remains a public health problem, particularly in sub-Saharan Africa. The disease is intimately connected to poverty and environmental factors. Our research was readily embedded into a multi-country schistosomiasis oversampling study. The aim of the study presented here was to determine the prevalence of Schistosoma mansoni and to investigate the role of water body characteristics and water-related human activities in disease transmission. In August and September 2022, a cross-sectional study was conducted in the western part of Côte d'Ivoire. Stool and urine samples were collected from 1602 and 1729 children aged 5-14years, respectively, in 65 villages in the health districts of Biankouma, Ouaninou and Touba. Additionally, data were collected from direct observation of water-related activities at water bodies and interviews conducted with community leaders and health workers. The prevalence and risk factors for Schistosoma infection were assessed using generalised estimating equation models. The prevalence ofS.mansoni and S.haematobium were 27.4% (95% confidence interval [CI] 21.5-34.3%) and 0.1% (95% CI 0.03-0.5%), respectively. Low prevalence of soil-transmitted helminths was observed with 2.4%, 0.4% and 0.2% for hookworm, Trichuris trichiura and Ascaris lumbricoides, respectively. At the health district level, we found S.mansoni prevalence of 34.4% (95% CI 25.0-45.3%), 34.3% (95% CI 24.0-46.2%) and 16.3% (95% CI 9.5-26.6%) for Biankouma, Ouaninou and Touba, respectively. Female and male participants were at a similar risk of infection (29.0% vs. 26.0%, odds ratio [OR]: 1.18, 95% CI 0.92-1.50). Children aged 9-14years showed a higher prevalence than their younger counterparts aged 5-8years (34.5% vs. 22.7%, OR: 1.80, 95% CI 1.42-2.27). High infection prevalence was observed in villages where children were washing clothes and dishes at open surface water sites and pursued recreational activities (e.g. swimming and playing in the water). The temperature, total dissolved solids and pH of water samples showed no significant association with S.mansoni infection at the village unit. Human water-related activities such as washing clothes and playing in the water are risk factors for S.mansoni transmission. Hence, preventive chemotherapy should be combined with information, education and communication to avoid or reduce the frequency of water exposure in children as part of a comprehensive package of interventions towards elimination of schistosomiasis as a public health problem.

Determination of three dechloranes in environmental water by magnetic solid-phase extraction-gas chromatography-negative chemical ionization mass spectrometry based on the covalent organic framework material

Dechloranes are additive-type chlorine flame retardants that are widely used in processing industrial products, such as electronic equipment and textiles. Dechloranes, which can enter the human body through various routes, pose significant health risks because of their toxicity, persistence, and bioaccumulation. In 2023, dechlorane plus was listed in the Stockholm Convention on Persistent Organic Pollutants. In the same year, China recognized this compound as a priority-controlled substance. Dechloranes are commonly found at trace levels in water, which is extremely harmful to the environment and human health. Therefore, the development of detection methods for dechloranes is crucial. Magnetic solid-phase extraction (MSPE) has attracted considerable attention because of its low organic solvent consumption, simplicity of adsorbent separation, and ease of operation. In general, the selectivity and efficiency of MSPE depend on the characteristics of the adsorbent. Covalent organic frameworks (COFs) have regular porosity, structural predictability and stability, high specific surface areas, and adjustable pore sizes, which are advantageous for a wide range of separation and analysis applications. In this study, Fe3O4 magnetic nanoparticles and a COF material (TpBD) were combined to prepare Fe3O4@TpBD as an adsorbent for dechloranes. Subsequently, an effective method for analyzing dechlorane in environmental water was established by coupling MSPE with gas chromatography-negative chemical ionization mass spectrometry (GC-NCI/MS). The successful synthesis of Fe3O4@TpBD was confirmed using transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and vibrating sample magnetometry. A single-factor method was used to optimize the extraction conditions, including the Fe3O4@TpBD dosage, pH of water sample, elution solvent type and volume, extraction time, elution time, and ionic strength. The target analytes were separated on a TG-5SILMS column (30 m×0.25 mm×0.25 μm) and quantified using the external standard method in the selected-ion monitoring (SIM) mode. Under the optimal extraction conditions, the method validation results showed a linear range of 2-1000 ng/L. The limits of detection (LODs) and quantification (LOQs) were 0.18-0.27 ng/L and 0.60-0.92 ng/L, respectively, for the three analytes. The intra-day and inter-day precisions at three spiked levels were 4.2%-16.2% and 6.9%-15.7%, respectively. This method was successfully applied to the determination of dechloranes in environmental water samples (laboratory tap water, reservoir water, wastewater treatment plant effluent, and landfill leachate treatment effluent). The recoveries of the three dechloranes at different spiked levels ranged from 77.8% to 113.3% with relative standard deviations (RSDs) of 2.5%-16.3% (n=3). With the advantages of operational simplicity, high sensitivity, and good reproducibility, the proposed method is suitable for the qualitative and quantitative determination of dechloranes in environmental water.

Assessment of Drinking Water Quality in Northern Ethiopia Rural Area: A Case Study of Farta District, South Gondar Zone

Access to safe drinking water remains a fundamental issue in rural areas of Ethiopia. This study aimed to evaluate the physicochemical and bacteriological quality of drinking water at protected sources in the Farta district, South Gondar Zone, Ethiopia. The study covered 16 rural Kebeles and was conducted on 75 protected dug wells with hand pumps (HDWs) and 17 protected springs (PSs). Data were collected during the wet and dry season, and field measurement were conducted on water samples pH, turbidity, electrical conductivity, and temperature, while laboratory analysis focused on E. coli prevalence. Additionally, sanitary risk assessment was also performed. The result showed that, the pH values ranged from 5.4 to 8.1, turbidity levels varied between 0 to 100 nephelometric turbidity unit (NTU), electric conductivity ranged from 62 to 584 µS/cm, and temperature ranged from 12.1 to 27 °C. Among all the samples, 39.1% had a pH below the minimum standard value of 6.5, close to 50.5% did not meet the turbidity requirement (5NTU), and all samples were safe against electric conductivity levels. The E. coli contamination was widespread, and only a small percentage of water sources, such as 21.7% HDWs, 6.7% PSs during dry season, and 13% HDWs during wet season were negative to E. coli detection. A significant proportion of water sources, such as 18% HDWs and 13% PSs during dry season, as well as 44.9% HDWs and 46.7% PSs during wet season, fell into the high microbial health risk category. Sanitary inspections revealed that only 16.7% of water sources were classified as low sanitary risk. This study revealed that majority of water sources were unfit to drinking and may endanger the public health. To ensure safe water availability frequent cleaning and disinfection of water sources, implementation of household water treatment, and improvement of WASH (water, sanitation and hygiene) infrastructure is needed.

Evaluation of potentially toxic elements and microplastics in the water treatment facility

The potentially harmful effects of consuming potentially toxic elements (PTEs) and microplastics (MPs) regularly via drinking water are a significant cause for worry. This study investigated PTEs (Cd, Cu, Cr, Ni, Pd, Zn, Co), MPs, turbidity, pH, conductivity, and health risk assessment in the water treatment plant in Kielce, Poland. Zn had the highest concentrations throughout the water treatment facility, whereas Cd, Pb, and Co had lower concentrations (< 0.1 µg/L). The order of the concentrations among the specified PTEs was like Zn˃Cu˃Ni˃Cr˃Cd˃Pb and Co. The minimum turbidity was 0.34, and the maximum was 1.9 NTU. The range of pH in water samples was 6.51—7.47. The conductivity was 1,203—1,445 ms in water samples. These identified MPs were categorized into fiber and fragments. The color of these identified MPs was blue, red, black, green, and transparent. The minimum and maximum size of the MPs was 196 and 4,018 µm, while the average size was 2,751 ± 1,905 µm. The average concentration of MPs per liter of the water treatment plant was 108.88 ± 55.61. The elements listed are C, O, Na, Mg, Al, Si, K, Ca, and Ti. Fe and Zn were the predominant elements seen using EDX. HQ values of the PTEs were less than one for adults and children. The human health risk associated with all detected PTEs revealed that the HQ values exhibit a satisfactory degree of non-carcinogenic adverse health risk. HI values for adults and children age groups were less than one. In most water treatment samples, the carcinogenic value exceeds the threshold value of 10−6. The PTEs and MP concentrations in drinking water should be periodically monitored to minimize consumers' environmental pollution and health risks.

Mapping of Water and Soil Quality Parameters in the Gampaha-Ihalagama East and Eldeniya East Grama Niladhari Divisions, Sri Lanka

Water and soil are important natural resources, and the study of their distribution is of great interest. The Grama Niladhari Divisions, Ihalagama-East and Eldeniya-East, located in the Gampaha district, are selected as the study areas, and this is done as a pilot study. Different water and soil quality parameters are investigated followed by the construction of contour maps. As water quality parameters, pH, conductivity, phosphate content, nitrate content, and Ca2+ hardness were determined, and as soil quality parameters, pH, nitrate, organic matter, water-soluble Na+ and K+, extractable Na+ and K+, and water-soluble Ca2+ ion contents were determined. The pH of water samples lies within the range of 4.41 - 7.11 and 3.79 – 7.18 in the Ihalagama-East and Eldeniya East divisions, respectively. Almost all the samples have acidic pH values, with some falling below the lower limit of the WHO guidelines for safe drinking water (6.5 - 8.5). Conductivity values vary from 52.0 - 277.0 µS/cm and between 54.0 – 403.0 µS/cm, respectively, which is below the WHO permissible level of 1500 µS/cm. The phosphate content varies from 1.374 - 3.986 mg/L in Ihalagama-East and water-soluble phosphate was not detected in Eldeniya-East, indicating a very low range and suggesting that the water samples are less contaminated with phosphate-containing substances. Considerably high values in the range of 1.24 - 279.00 mg/L for Ihalagama-east and 59.5 mg/L - 168.0 mg/L for Eldeniya-East, are obtained for the nitrate content where most of them are beyond the safe level of drinking water, 50 mg/L. The soil pH in all the samples falls within the acidic range, varying from 2.99 - 6.73 in Ihalagama-East and 3.07 – 6.68 in Eldeniya-East. Most of the soil samples contain high nitrate contents, indicating significant contamination. The percentage soil organic matter content varies between 0.60% and 13.27% in both areas. Many fertile agricultural soils typically have an organic matter content ranging from 3% - 6% revealing that most of the samples are beyond the standard levels. The distribution of water-soluble and extractable cations does not exhibit a wide range. According to the findings, though two Grama Niladhari Divisions are selected, they also display a huge variation. This reveals the importance of mapping to address contaminations, effects of natural disasters which lead to changes in the studied water and soil quality parameters.

Determination of Fluoride Levels and pH in Community Drinking Water Supply across Pune City, Maharashtra

Context: The knowledge of fluoride levels and pH in potable water is important for health-care personnel and policymakers in general and dentists in particular, but the data regarding fluoride levels and pH of community drinking water in Pune City are deficient. Aims: The aim of this study was to determine the fluoride levels and pH in community drinking water supply across Pune City, Maharashtra. Subjects and Methods: In an in vitro, experimental study, a total of 30 water samples were collected from one water treatment plant, one water storage reservoir, and three adjoining residential areas of the Pune Municipal Corporation (PMC) and Pimpri Chinchwad Municipal Corporation (PCMC) region. They were analyzed for fluoride content using (2-(parasulfophenylazo)-1,8-dihydroxy-3,6-naphthalene disulfonate) based-spectrophotometric method, and for pH using a digital pH meter. Statistical Analysis Used: Fluoride and pH values were subjected to Mann–Whitney U-test and intragroup comparison of fluoride and pH levels at various levels of water distribution was performed using Kruskal–Wallis test. Results: The mean concentration of fluoride and the pH in water samples from different locations across Pune City were 0.262 and 7.02 mg/L, respectively. Although levels across various sources were different, there was no statistical difference between the fluoride content or the pH of the water from sources across PMC and PCMC regions. Conclusions: The fluoride content of the community water supply of Pune City was below the recommended standards yet within the permissible limits in considering the temperature range in Pune City across different seasons. The pH of the drinking water of Pune City was optimal.

Determination of four phenolic endocrine-disrupting chemicals in water by dispersive solid-phase extraction-ultra performance liquid chromatography-tandem mass spectrometry based on metal-organic skeleton porous carbon materials

Phenolic endocrine-disrupting chemicals (EDCs) are exogenous substances that interfere with the endocrine system and disrupt normal cell functions upon entering a living organism, leading to reproductive and developmental toxicity. Therefore, the development of a rapid and efficient analytical method for detecting phenolic EDCs in environmental waters is crucial. Owing to the low concentration of phenolic EDCs in environmental water, appropriate sample pretreatment methods are necessary to remove interferences caused by the sample matrix and enrich the target analytes before instrumental analysis. Dispersive solid-phase extraction (DSPE) has gained considerable attention as a simple and rapid sample pretreatment method for environmental-sample analysis. In this method, an adsorbent material is uniformly dispersed in a sample solution and the target analytes are extracted through processes such as vortexing. Compared with traditional solid-phase extraction (SPE), DSPE increases the contact area between the adsorbent and sample solution, reduces the required amounts of adsorbent and organic solvents, and improves the extraction efficiency. The adsorbent material plays a critical role in DSPE because it determines the extraction efficiency of the method. Metal-organic frameworks (MOFs) are porous framework materials composed of metal clusters and multifunctional organic ligands. They possess many excellent properties such as tunable pore sizes, large surface areas, and good thermal and chemical stability, rendering them ideal adsorbent materials for sample pretreatment. MOF-derived porous carbon materials obtained through high-temperature carbonization not only increase the density of MOF materials for better separation but also retain the advantages of a large surface area, highly ordered porous structure, and high porosity. In this study, a porous carbon material derived from an MOF, named as University of Oslo-66-carbon (UiO-66-C), was synthesized using a solvothermal method and applied as an adsorbent to enrich four phenolic EDCs (bisphenol A, 4-tert-octylphenol, 4-nonylphenol, and nonylphenol) in water. A method combining DSPE with ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was established to analyze these phenolic EDCs in water. The UiO-66-C dosage, pH of water sample, adsorption time, eluent type and volume, elution time, and ion strength were optimized. Gradient elution was performed using methanol-water as the mobile phase. The target analytes were separated on an ACQUITY UPLC BEH C18 column (100 mm×2.1 mm, 1.7 μm), and multiple reaction monitoring (MRM) was conducted in negative electrospray ionization mode. The method exhibited a linear correlation within the range of 0.5-100 μg/L for the four phenolic EDCs. The limits of detection (LODs) and quantification (LOQs) of the four phenolic EDCs were 0.01-0.13 μg/L and 0.03-0.42 μg/L, respectively. The precision of the method was evaluated through intra- and inter-day relative standard deviations (RSDs), with values ranging from 1.5% to 10.6% and from 6.1% to 13.2%, respectively. When applied to the detection of phenolic EDCs in tap and surface water, the spiked recoveries of the four phenolic EDCs were 77.1%-116.6%. Trace levels of 4-nonylphenol and nonylphenol were detected in surface water at levels of 1.38 and 0.26 μg/L, respectively. The proposed method exhibits good accuracy and precision; thus, it provides a new rapid, efficient, and sensitive approach for the detection of phenolic EDCs in environmental water.

Chemophysical and Metallic Characterization of Surface Water and Precipitation for Environmental Quality Assessment in Oyigbo L.G.A., Rivers State, Nigeria

This study investigates the repercussions of oil industry operations on environmental quality in the Niger Delta, with a specific focus on atmospheric soot contamination. By conducting chemophysical and metallic characterization of surface water (river) and precipitation (rain) in Oyigbo, Rivers State, Nigeria, the research evaluates various chemical and physical parameters, like pH, electrical conductivity (EC), total suspended solids (TSS), turbidity, as well as concentrations of heavy metals like lead (Pb), copper (Cu), cadmium (Cd), and zinc (Zn). The findings uncover a slightly acidic to neutral pH in water samples. The elevated EC in the Imo River, while meeting WHO standards, highlights the delicate balance between industrial development and environmental health. Turbidity values, meeting WHO standards but exceeding limits in some rainwater samples, prompt scrutiny of anthropogenic influences, with fishing and sand mining emerging as potential contributors to river turbidity, while TSS values, though higher along the Imo River, remain within WHO standards. Results reveal Cd, Cu, and Zn adhere to standards, while the elevated Pb levels necessitate further exploration into contamination sources. The heavy metals pollution index (HPI) categorizes the area as polluted and identifies lead as the primary contributor, underlining the urgency of interventions. The potential ecological risks index (PERI) classifies the pollution risk as slight, indicating a low ecological risk level, and reveals risk hierarchies, in the order of metals contributing to pollution as Pb &gt; Cu &gt; Cd &gt; Zn for both river and rainwater. This study unravels the relationship between industrial activities and water quality in Oyigbo, contributing substantively to sustainable water resources and environmental management. The detailed findings stand as a cornerstone for informed decision-making, aiming to mitigate environmental impacts and safeguard ecosystems and communities reliant on vital water sources.

Production and purification of water using natural based adsorbent from plantain peels

Activated charcoal or carbon commonly employed as filter examinant of water, and air with surface area of 300–2,000m2/g, adsorbs a wide range of impurities and contaminants. This study was undertaken to produce adsorbent from plantain peels (Natural based), for the treatment of water samples, subsequently tested. Pyrolysis activation method was adopted using H3P04 and KOH. Water samples of wells from Gonigora, boreholes from Ungwan Romi, fishponds from Kawo and Kaduna Polytechnic, river water from river Kaduna, rain, tap from Tudun Wada and Eva water from Coca-Cola were used for the analysis. Which include water treatment, pH determination, total suspended, total dissolved, and total volatile solids, colour and odour determination. The results showed activated carbon effectiveness on pH of water samples well within 7.00, for borehole, Tap, and 7.02, for pond, rain and Eva waters, while 7.10 for river water. This indicated that the adsorbent is active and compared favorably with the standard adsorbent which pH of the water samples treated were 7.00 for pond, rain, tap and Eva, while 7.02 and 7.04 for borehole and river water respectively. This validated the production of granular natural based adsorbent via pyrolysis of plantain peels at 4500C by chemical activation method. Therefore an economical adsorbent obtained naturally based as cheap, readily available waste material for future commercial purification application.

Determination of Fluoride in Gravity Feed System Water and Health Risk Assessment of Exposure to Fluoride among Indigenous People in Sungai Mas, Pahang

Introduction: To determine fluoride levels in gravity feed system water of Sungai Mas Village in Sungai Lembing, Kuantan, and its related potential health risk due to fluoride exposure from drinking water among adult indigenous people in the area. Methods: Adults who have lived in Sungai Mas Village, Pahang, for more than one year and use gravity feed system water as a drinking water source were selected as respondents. A set of questionnaires was used to determine socio-demographic and information on gravity feed system water usage among the respondents. A handheld Fluoride low-range (LR) Color-imeter and a portable pH meter were used to measure fluoride levels and pH in water samples, respectively. A body weight scale was used to measure the weight of respondents. Results: A total of 80 indigenous people in Sungai Mas Village were chosen as respondents. From 80 water samples col-lected, 98.75% had fluoride lower than the Malaysian National Standard for Drinking Water Quality’s permissible level (0.4 – 0.6 mg/L), while 1.25% had a fluoride level within the said level. Fluoride ranged from 0.10 to 0.41 mg/L, while pH ranged from 7.67 to 8.20, meaning 100% of the water samples had pH within the permissible level. The Hazard Quotient (HQ) was less than 1 (HQ &lt; 1). Conclusion: Water samples in the study area had low natural fluoride, which is insufficient to eradicate dental caries. Meanwhile, the value of the hazard quotient suggests that adults in Sungai Mas Village may not be at risk of developing dental and skeletal fluorosis.

Contributions of heavy metals on Underground Water quality of Dumpsite in Rukpokwu, Rivers State, Nigeria

Waste dump sites have constituted major challenge to ground water quality in neighbouring environment. This study was carried out to assess the contributions of heavy metals in groundwater from abandoned Rukpokwu dumpsite after a 6-month use. Samples were collected and immediately transferred to the laboratory for standard analysis. The values of parameters of water samples pH ranged from 7.02 – 6.98. were quite below the WHO and NSDWQ limits. Conductivity ranged from 42.73- 19.91, TDS ranged from 10.76 -44.56, Turbidity ranged from 3.87 – 20.02, BOD ranged from 0.92 – 2.90, COD ranged from 1.74 – 3.21, Fe., ranged from 0.02 – 1.13, Zn ranged from 0.00 – 0.19, Cu ranged from 0.00 – 0.14,Pb, Cd and Cr were not detected in all the water samples. This might be that the contaminants could not migrate to the water table or aquifer within the period of use and study of the dumpsite.

Integrated analysis approach of water and solids for root cause of injectivity decline of water injection well – A case study

Accurate sampling and analysis of injection and flow back water and solids are pivotal to identify the root causes of injectivity decline of water injection well. The present paper is focussed on case study of detailed characterization of injection and flowback water and solids using combination of techniques such as X-ray diffraction (XRD), x-ray fluorescence (XRF), scanning electron microscopy, inductively coupled plasma optical emission spectroscopy, ion chromatography and water isotope analyser in investigating the cause of injectivity decline. The present study emphasizes the effect of pressurized and non-pressurized water sampling on water analysis results, their scaling tendencies and correlation with compositions of solids encountered. Surface pressurized injection water sample pH result was found acidic with a higher dissolved iron and lower total suspended solids (TSS). Non-pressurized water samples showed comparatively higher pH due to release of CO2. Langelier saturation index (LSI) and ScaleSoftPitzer™ program SI of pressurized water sample showed lower scaling tendency than the non-pressurized water sample. Non-pressurized water samples contained significantly higher concentrations of TSS than the pressurized water sample indicated precipitation of salts in non-pressurized sample. Composition of TSS revealed presence of iron-based compounds, calcite and gypsum. Geochemical and water isotope analysis showed identical composition of injection and flowback water. XRD and XRF analysis of trapped solids revealed different forms of iron oxides and iron sulphides as major phase along with appreciable amount of calcite and quartz. XRF analysis also showed traces of Cr, Mo, and Ni in trapped solids indicated corrosion of tubing/pipes. Solid composition correlates with scaling tendency predicted by ScaleSoftPitzer™ program SI. Presence of iron in pressurized injection water and iron compounds in solids indicate iron-based scale/corrosion as key reason for reduction in injectivity of the well. Systematic sampling, accurate and integrated analysis of water and solids can help to find the dominant causes of injectivity decline and direct oilfield engineers at well site to take appropriate remedial and preventive action.

Water contamination with protozoa in Kirkuk province

A total cf 150 water samples examination in Kirkuk province were carried out using direct deposit examine microscopically, study parameters involves four type of water collections : direct (governmental pipes), indirect ( tank vehicle) ,well water &amp; river water ( Khasah Sou), which divided in to four positions. The main aims of this study are to detect role of parasitic stages in contamination of water in Kirkuk Province &amp; to assess the relationship between water contamination with protozoa &amp; some water quality tests like (PH, Turbidity &amp; chlorine percentages). The result of the study shows all rate of contamination 14%, which divided into 12 % &amp; 2 % in urban area &amp; rural area respectively ,P&lt;0.05. River water shows high rate of contamination 12 %, followed by 1.33 % &amp; 0.66% from direct (Governmental pipes) &amp; well water respectively P&lt;0.05.The rate of water turbidity was 10.66 % with high occurrence in river water 5.33 % &amp; the lowest rate 0.66% was in wells. P&lt;0.05.Abnormal chlorine percentage was seen in 6-water sample with the rate 4 % P&gt;0.05. Abnormal PH of water samples were ranged from 5.23 to 10.3 which had no role in frequency of parasitic forms in ‘water, P&lt;0.05.The more common parasitic forms that found are Entamoeba histolytica that was highly dominated in river water 12 % followed by Giardia lamblia 3.22%. Other microorganisms that are isolate include&#x0D; Candida species 12.6 % and Paramecium 12%. Total rate of water contamination with microorganisms is 42 %.

A dual-mode pH sensor film based on the pyrene-based Zr-MOF self-destruction with fluorescence turn-on effect

Rapid detection of on-the-spot water sample pH has become an urgent problem to resolve, and developing a method with the characters of fast, convenient and low-cost is significant. In this study, an amino functionalized pyrene-based Zr-MOF (NU-1000-NH2) was synthesized by solvent-assisted ligand incorporation (SALI) method, in which the Zr6 metal cluster, fluorescent pyrene-based H4TBAPy and p-aminobenzoic acid were acted as node, linker and modulator, respectively. The as-synthesized NU-1000-NH2 possessed the pH-dependent fluorescence enhancement property at 450 nm emission under alkaline condition, thus a convenient fluorescence “turn-on” pH sensor was fabricated. Upon introduction of OH–, the carboxylate groups in NU-1000-NH2 could react with it, and the deprotonation and gradual collapse of the NU-1000-NH2 crystal were occurred, resulting in the release of the fluorescent H4TBAPy ligand and fluorescence enhancement. Moreover, to solve the difficulties of on-the-spot pH detection, the solid-phase pH film sensor was successfully constructed by embedding the NU-1000-NH2 particles into the polyvinyl alcohol (PVA), combining with the RGB model and smartphone detector. The proposed fluorescent MOF-based pH sensor with dual-mode detection is expected to achieve on-the-spot pH monitoring in the field of environmental monitoring.

Assessments of some trace metals in water samples of nursery pond of Grass Carp (Ctenopharyngodon idella, Valenciennes, 1844) in Bannu Fish Hatchery of Khyber Pakhtunkhwa, Pakistan

Abstract The present investigation was aimed to examine the concentrations of trace metals including e.g copper (Cu), manganese (Mn), nickel (Ni), and zinc (Zn) in water samples collected from nursery pond of grass carp (Ctenopharyngodon idella) in Bannu Hatchery of Khyber Pakhtunkhwa during the period from April 2018 to January 2019. The temperature and pH of each water sample were measured for the whole study duration. The concentration of Copper (Cu), Manganese (Mn), Nickel (Ni), and Zinc (Zn) in collected water samples were measured in mg/liter by using Atomic Absorption Spectrophotometer. The blank and standard solutions for device calibration Standard solutions i.e., 2.0 mg, 4.0 mg, and 6.0 were used to measure the concentration of these metals in water samples to verify the measurements. The data was statistically analyzed on descriptive statistics (estimation of proportions and standard deviation) used to summarize mean concentration. The results obtained of both temperature and pH of water samples were found in ranged 10 to 36 0C and 7.0 to 8.44; whereas the size of fry stages was ranged from 4.0 to 56.0 mm in total length. The results of investigated metals found in pond water samples are in order of Zn&gt;Mn&gt;Ni&gt;Cu, respectively. As optimum temperature and pH for grass carp were mostly between 15 0C and 30 0C and pH 6.5 to 8.0. It was concluded from obtained results that temperature, pH, and trace metals were found appropriate for the growth of Ctenopharyngodon idella from fry to fingerling stages, but the highest amount of zinc can cause its mortality. It is a preliminary study on grass carp culturing in Bannu fish hatchery so, it would provide useful information for model fish seed production unit in a hatchery.

Assessment of Physico-Chemical Parameters of Water Samples Collected from the Southern Part of Bangladesh

Bangladesh has a vast natural water resources. In order to determine the water quality parameters such as pH, EC, DO, BOD, TOC, ionsi.e., NO3-, SO42-, PO43- and heavy metals, thirty surface water samples were collected from the southern part of Bangladesh includingthe coastal regions of Patuakhali district and Kuakata sea beach area during the dry season. The pH of water samples was ranged from7.58 to 8.77 with an average of 8.15. The average conductivity value was 8.83±2 mS/cm. The average DO was 8.33±1.82 mg/L andBOD was 0.31±0.03 mg/L. TOC was found between 0.78 and 1.78 mg/L with an average of 1.24 mg/L. The concentration of NO3-,SO42-, PO43- was determined by ion chromatography and only sulphate ion was detected in a very low concentration. Water samplesfrom different sources were analysed for five metals by AAS and the concentrations of Pb, Cd, Mn, Hg and As were below 0.2, 0.01,0.22, 0.001 and 0.005 mg/L, respectively. Dhaka Univ. J. Sci. 70(1): 49-57, 2022 (January)

(Digital Presentation) Water Treatment through the Arc and Pulsed Spark Discharge

Water deterioration and depletion are accompanied by population growth and fast urbanization, posing major environmental problems. The prevalence of water-borne infections remains high, making it critical to discover effective ways of disinfecting water thoroughly. The main methods for inactivating a wide spectrum of harmful bacteria are chemical, physical, electrochemical, and radical. Conventional decontamination methods not only fail to completely disinfect water but also have several drawbacks, including the generation of disinfection byproducts; the complexity of disinfection reactor design; high energy consumption; and high running expenses. As a result, a versatile approach should be developed to overcome the limitations of current decontamination methods while also being efficient against a variety of diseases. Plasma-based water treatment has recently emerged as a possible alternative to traditional approaches. Plasma has proven to be more effective than conventional oxidants and disinfectants, both directly and indirectly. Plasma-related effects vary depending on the type of discharge, device settings, and process parameters. Electrical discharges are one of the most effective water treatment treatments. To this end, two plasma discharges, i.e., arc and pulsed spark discharge, are used for the treatment of synthetic contaminated water with microorganisms, which can be used for naturally contaminated surface water. Our results revealed that in comparison to arc discharge, pulse spark discharge produces more extreme acidic conditions by lowering the pH of water samples as well as a more reactive environment, which results in greater antibacterial efficacy. Furthermore, water samples treated with arc discharge had greater temperatures than water samples treated with pulse spark discharge, indicating that temperature was not a critical effector in the plasma-based sterilizing process.

Investigation of Physiochemical Properties of Groundwater at Estako-West, Edo-North, Nigeria

The physicochemical parameters of groundwater at Auchi and South-Ibie were investigated to determine underground water quality in this environment. Water sampled locations in Auchi were categorized as Iyekhei (Iyekhei), Auchi Poly Water (Auchi PW), Auchi Poly Hostel (Auchi PH), Double Delight Hostel (DDH); South-Ibie locations are Levis Gas Plant (LGP), Pastoral Centre (PC), Global Castle Hostel Sawmill Road (GCHS), Arsenal Hostel and, Lagos Street (AHLS). A total number of 80 water samples from eight locations were collected and analyzed using some statistical metrics to determine the relationship among measured parameters. The pH of water samples ranged from 1.4 at GCHS to 4.12 at AHLS. The result indicated that all the investigated water samples have low pH values with a high alkalinity level. Total dissolved solids (TDS) of 300mg/L, 400mg/L, and 500mg/L were obtained from the water samples at Iyekhei, Auchi PH, and DDH. These values are within the allowable World Health Organization (WHO) standard. However, the chloride level for all locations was very high except for Iyekhei, with a value of 115 mg/L, which is accepted within the WHO requirement of 250 mg/L. Conductivity values of four sampled water locations; namely, Auchi PH, DDH, PC, and GCHS, are within the allowable limit. High conductivity values of 304 sm/cm, 116.7sm/cm, and 845 sm/cm were obtained for LGP, Auchi PW, Iyekhei, respectively. All the water sampled locations’ results indicated that none of the sampled water is within the WHO required standard of 20oC to 23oC. The statistical metrics showed a strong relationship between the conductivity and chloride concentration with R2=0.7174; this may be related to some dissolved conductive ions in the water sampleThe research study’s output is imperative to understand the relationship between different groundwater parameters to develop and good groundwater quality.

Development and Characterization of Integrated Nano-Sensors for Organic Residues and pH Field Detection.

Meeting global water quality standards is a real challenge to ensure that food crops and livestock are fit for consumption, as well as for human health in general. A major hurdle affecting the detection of pollutants in water reservoirs is the lapse of time between the sampling moment and the availability of the laboratory-based results. Here, we report the preparation, characterization, and performance assessment of an innovative sensor for the rapid detection of organic residue levels and pH in water samples. The sensor is based on carbonaceous nanomaterials (CNMs) coated with an intrinsically conductive polymer, polyaniline (PANI). Inverse emulsion polymerizations of aniline in the presence of carbon nanotubes (CNTs) or graphene were prepared and confirmed by thermogravimetric analysis and high-resolution scanning electron microscopy. Aminophenol and phenol were used as proxies for organic residue detection. The PANI/CNM nanocomposites were used to fabricate thin-film sensors. Of all the CNMs, the smallest limit of detection (LOD) was achieved for multi-walled CNT (MWCNT) with a LOD of 9.6 ppb for aminophenol and a very high linearity of 0.997, with an average sensitivity of 2.3 kΩ/pH at an acid pH. This high sensor performance can be attributed to the high homogeneity of the PANI coating on the MWCNT surface.